Changed ok text to be an ok gui icon

docs/user_manual/working_with_vector/vector_properties.rst

@@ -2981,7 +2981,7 @@ to open the :guilabel:`Duplicate Action` dialog. You must have at least one exis
 in order to create a duplicate.
 
 In the dialogue that appears, make any changes that are necessary. See :ref:`adding_actions` 
-for further information. Once finished, press Ok to create a duplicate of the action with 
+for further information. Once finished, press :guilabel:`OK` to create a duplicate of the action with 
 any changes that you made. If you did not edit the description, or if you changed it to be 
 identical to the description of any other existing action, "_1" will be added to the end of it.